Scaffolding



April 2, 1957 H. G. LEONARD SCAFFOLDING Filed Oct. 25. 1954 ga. g @fdTQ/4 nited States Patent Office SCAFFOLDING Henderson G. Leonard,Covert, Mich.

Application Gctober 25, 1954, Serial No. 464,386

1 Claim. (Cl. 304-17) This invention relates to improvements inscaffolding and more particularly to scaffolding of that type adapted tobe readily attached to structural beams such as I-beams, invertedT-beams, girders, etc. that may form part of bridges and/ or otherstructures; and as readily detached therefrom, and that may be, while inuse, anchored to such supports and depending therefrom and that may beshifted therealong to follow the progress of work upon said structures,such as repair work, painting, and the like.

An object is to provide scaffolding that is simple in structure, readilyadjustable to accommodate the work in hand, that is of light weight,durable in use and inexpensive to manufacture. A further object is toprovide scaffolding that is so constructed as to be safe in use, capableof use readily by persons with little previous experience with suchdevices and that occupies small space thus making it adaptable to workin close quarters and in places ordinarily diicult of access withconventional equipment.

vWith the foregoing and other objects in View as will hereinafterappear, the invention consists of certain novel features ofconstruction, combination and arrangement of parts as will be describedin detail, defined in the claim and illustrated in the accompanyingdrawing forming part of this disclosure, and in which- Fig. 1 is a viewin elevation of the instant scaffolding illustrating its application, aconventional platform used in connection therewith being omitted.

Fig. 2 is an edge View of Fig. l,

Figs. 3 and 4 are detail views taken respectively on the lines 3-3 and 44 of Fig. l.

Fig. 5 is an elevational view of a modified lower portion of thescaffold.

Fig. 6 is a View of Fig. Staken at right angles thereto, and

Fig. 7 is a cross-sectional View on line 7-7 of Fig. 6.

The reference numeral 1 denotes a portion of a girder, inverted T-beamor the like having the flange 2 to which the instant scaffolding may beapplied and/or anchored or adjusted therealong. The scaffolding includesthe pendant scissors jack 3 the arms 4 of which are desirably round incross section except beyond a point 5 from which to their free ends theyare reduced in diameter to facilitate the scissors action, said armseach terminating in an upper jaw 6 and a lower jaw 7, the jaw 6 eachhaving a head 8 and contiguous thereto a roller 9 retained in place bysaid head and a bend in the arm at its juncture with the jaw.

Secured, as by welding, to the arms 4 are the chain links 10, 10connected to each other by the turnbuckle 11 by means of which the arms4 may be adjusted to clamp an object such as the flanges 2. The arms 4are connected to rings 12 which are connected to a single ring 13 which,referring now only to Figs. 1 and 2, is connected by the S-hook 14 tothe yoke 1S secured to the upper end of the metal bar 16 formed with aplurality of round perforations 17 for cooperation with a flat bar 18formed with elongated perforations 19, and with round perforations 17aforesaid, the bars 16, 18 releasably anchored to each other by bolts(not shown) removably secured in the round perforations 17 at the endsof said bars. Bolts 20 and nuts 21 releasably connect the elongatedperforate portions of bar 18 to bar 16 to retain said bars in adjustedpositions.

Integral with the lower end of the bar 18 is the dual hanger 22, eachhanger portion being of square shape and of a size to accommodate aWooden 4 x 4" beam forming part of a conventional work platform, thisscaffolding being used usually in pairs to carry, in said hangers, theends of the wooden beams at a point below the girder convenient for mento work from upon the platform. Scaliolding is applied to the horizontalgirder or beam by releasing the turnbuckle 11 to spread the jaws andpermit them to be applied to the flanges 2 and then again tightenedthereupon. The scaiiolding is easily shifted along the flanges 2 by oneman, the rollers 9 travelling upon same. The conventional platformincludes a at tablelike board or boards nailed or Votherwise secured tothe 4 x 4 beams, the ends of which extend beyond said board andV arereceived in said dual hanger.

Referring now to Figs. 5, 6 and 7 a ring 25, similar to ring 13, isengaged by a pig-tail hook 26 integral With one end of the flat bar 27connected by bolts 28 having thereon nuts 29 to a similar bar 30terminating in a single oblong hanger 31 adapted to carry a scaffoldbeam similarly shaped in cross-section, the said bar 27 connected also,permanently, to bar 30 by a terminal metal strap 32 and `an auxiliarystrap 33.

In the form shown in Figs. 1 and 2 two beams are carried in the hanger22 while in the form shown in Figs. 5 and 6 a single one is to becarried, the beams being used perch-like by the workmen who may sitdirectly upon same or upon boards or planks secured to or carried by thependant structures, the pendant structures being provided in suchnumbers as may be desired depending upon the area of the platform andthe number of workmen to be accommodated thereby at a time.

What is claimed is:

In travelling scaiolding for use primarily in overhead work inconnection with I-beams having flanges, a scissors jack having twin armspivotally connected to each other adjacent their lower ends, said armsadjacent the connecting pivot having flattened portions to permitmaximum span operation, said arms having opposed, cooperating, integral,upper jaws at the upper ends of said arms extending at right anglesthereto and opposed, cooperating,

integral lower jaws spaced below said upper jaws a distance slightlygreater than the thickness of the 1-beam flanges, rollers carried bysaid integral, upper jaws for travel over the I-beam flanges, chains, anend link of each chain connected to each arm adjacent said lower jaw, aturnbuckle connecting the free terminal links of said chains for spacingadjustment of the jaws, elongated vertically extending superposed barsadjustably and detachably connected to each other, a ring attached tothe lower end of each of said arms, each of said rings being attached toa third ring, said third ring being pivotally connected to one of saidbars by a pig-tail hook, and a hanger carried by the other of said bars.

References Cited inthe tile of this patent UNITED STATES PATENTS 310,767Wilson Jan. 13, 1885 680,322 Faust Aug. 13, 1901 842,331 Palmer lan. 29,1907 1,211,997 Ahlander Ian. 9, 1917 1,561,850 Guttman Nov. 17, 19251,929,325 Masterson Oct. 3, 1933 FOREIGN PATENTS 12,173l Great BritainMay 22, 1912 40,710 Austria Jan. 25, 1910 Patented Apr. Z, 1957 j

